Insulator of overhead electric conductors.



No. 825,204, PATENTED JULY 3, 1906;

' E. GIRAUD.

INSUL'ATOR OF OVERHEAD ELECTRIC GONDUGTORS.

AP'PLIOATIION FILED APR.10. 1905. Y

W6 616666 6 Elva/z 02'' UNITED STATES PATENT OFFICE.

EMILE GIRAUD, 0E PARIS, FRANCE.

Specification of Letters Patent.

Patented July 3, 1906.

Application filed April 10, 1905. Serial No. 254,837.

To all whom it may concern:

Be it known that I, EMILE GIRAUD, engineer, a citizen of the French Republic, residing at Paris, France, have invented certain new and useful Improvements in Insulators of Overhead Electric Conductors, of which the following is a specification.

This invention relates to improvements in connection with insulators used to support overhead electric lines consisting of two highvoltage conductors, and has for its object to insure that when one of the conductors breaks both conductors are thrown out of circuit, as described in the specification of British Letters Patent No. 23,978 of 1903.

In the accompanying drawings, Figure 1 is a front view, and Fig. 2 a side view, of an apparatus constructed in accordance with this invention for two conductors having the same potential. Fig. 3 is a horizontal sectional view on the line A A of Fig. 2. Figs. 4 and 5, respectively, are views of the line in its normal state and with a conductor broken.

In Figs. 1 and 2 the insulator, which may be of the usual construction, comprises a support a, of any known pattern, provided with fastening-jaws b, jointed on a pin 0, and a bell d, wherein a vertical bolt 6 is so attached as to be electricallyinsulated therefrom. Round the bolt e can turn two arms or levers ff, each carrying a lug g g. The conductors h h are fixed to the lugs g g in the usual manner. The support a carries two metal arms or branches z', electrically connected with earth, these arms or branches extending downward on each side of the insulator between the two conductors as far as the heads of the bolts and j, which connect the lugs g g to the arms or levers ff. If one of the conductors breaks, the lever f or f corresponding to the conductor that is broken, turns on the bolt e and its bolt j or y" comes into contact with the lower part of one of the metal arms or branches "L. The two conductors are thus connected through the arm 11 with the earth, so that the circuit breaker or breakers are actuated according as the line is fed at one end or at both ends and the conductors are thrown out of circuit. It will be apparent that the dynamo Z supplies the current to the line and the circuit-breaker 7c is interposed in the line and the arms i connected with the earth, and as the two conductors have the same potential it is not necessary that the metallic arms ff be insulated from one another. Thus if one of the conductors breaks and communicates with the earth through the arms i the other conductor communicates also with the earth through the arms f f and the arms i. The two conductors are thus thrown out of circuit.

Having now particularly described and ascertained the nature of my said invention .and in what manner the same is to be performed, I declare that what I claim is 1. In a connection of the class described, means for supporting two conductors having the same potential, levers pivotally connected to said means, each of said levers carrying one of the conductors, said levers capable of turning on one and the same connection, a conducting-piece for engagement with the levers when turned by the rupture of the conductor and adapted to be electrically connected with the earth, substantially as described.

2. In a connection of the class described, a support having fastening-jaws, a pin supported by said jaws, movable members connected to said pin, means connected to said members for supporting conductors, and means arranged in the path of said members and adapted for contact therewith for grounding the circuit when the same is severed.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

EMILE GIRAUD.

Witnesses PIERRE LEINE, PAUL BLUMM. 

